Radio tuning mechanism



June 30, 1931. w. GOODWIN RADIO TUNING MECHANISM Filed Oct. l1, 1930 /l/Ilm Patented June 30, 1931 YUNITED STATES PATENT OFFICE WINSLOW GOODWIN,OF CHICAGO, ILLINOIS, ASSIGNOR TO ORDINE NAME PLATE 85.

MANUFACTURING CO., 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS RADIOTUNING MECHANISM Application filed October 11, 1930. Serial No. 488,134.

My invention relates to radio-tuning mechanism of the type comprising amanually-operative dial-equipped disk disposed parallel with the frontpanel of the casing of the radio-receiving apparatus and directlyconnected with the condenser, or condensers, ork

the like mechanism.

One of my objects is to provide such a disk which may be readily andconveniently manually operated; which will be smooth and positive inoperation and by which the desired delicate adjustment of the structureoperated thereby may be effected without back lash or lost motion.

Another object is to provide such a construction whieh will be ofpleasing appearance, economical of construction and may be easily andeconomically assembled with the other parts of the radio-receivingapparatus; and other objects as will be manifest from the followingdescription.

Referring to the accompanying drawings:

Figure 1 is a face view of the dial-equipped disk of radio tuningmechanism together with an escutcheon associated therewith andconstituting an embodiment of my invention.

Figure 2 is a rear view of the assembled parts shown in Fig. 1; and

Figure 3, a view in vertical section of the structure shown in Figs. 1and 2 illustrating it assembled with other parts of a radio receivingapparatus with which it cooperates.

In accordance with the preferred illustrated embodiment of my inventionthe structure comprises a disk 4 having its peripheral edge beaded asrepresented at 5 and knurled as represented at 6, the disk 4 being shownas provided with an arcuate opening 7 over which an arcuate sheet 8 ofCelluloid or other material adapted fory the transmission therethroughof light, preferably translucent, extends, the sheet 8 being preferablysecured to the rea-r side of the disk 4 as by rivets 9 and presenting onits front side a series of graduations 10 such as are commonacross theface of the disk 4 and by the omission of the flanges at the oppositeside edges thereof presents openings through which portions of the diskextend as shown in Fig. 1 to render the disk accessible for operationeither by applying hand pressure to one side edge of the disk or bysimultaneously grasping the disk at its opposed exposed edge portions.

The disk 4 is preferably rearwardly offset relative to the beaded edgethereof and the escutcheon is likewise rearwardly offset as shown inFig. 3 to cause it to conform generally in cross-sectional shape to thecrosssectional shape of the disk, the escutcheon containing an arcuateopening 17 through which a portion of the dial is exposed, a pointer 18being provided on the escutcheon he opening 17 for cooperation with thecia In Figure 3 I have shown the above described parts assembled withother parts of a radio receiving apparatus comprising a gang condenser19 shown as supported on a sub-base 2O of a cabinet the front panel ofwhich is represented at 21.

In this construction the panel 21, shown as formed of sheet metal butwhich may be of wood or any other suitable material if desired, isapertured at 22 in registration with the opening 17 in the escutcheon,and also at Y said plate being secured to said panel and extending overthe face of said disk and exposk 23 for the projection therethrough ofthe outer end of the shaftr24 of the gang condenser 19.

In assembling the dial-disk 4 and the escutcheon 1S with the lshaft 24and panel 21, the sleeve 11 is slipped over the end of the shaft 24 tothe position shown and the set screvv 12 vtightened toV securely connectthe sleeve 11 to the shaft 24. The escutcheon 13 is then applied to aposition extending across the disk 4 the escutcheon 13 having asocketknob 25 rigid thereonv which has a running fit over the outerendof the shaft and serves to so position the escutcheon relative to thedisk 4 that, While the escutcheon is caused to extend into closeproximity to the disk 4, rubbing contact of the disk 4 With theescutcheon is positively prevented. The escutcheon thus" positionedextends at its lugs 15 flatvvise against the panel 21 to Which it may besecured in any suitable Way as for example by rivets or screw-boltsextending through the openings 16 and registering holesV in the panel.

The condenser shaft 24 is thus operated ldirectly from the disk 4 Which,by reason of its f relatively great size, permits of the accurateadjustment ofthe movable elements of the condenser Without back lash orlost motion, the exposing of a portion of the peripheral edge of thedial through an opening, and preferably through vdiametrically disposedopenings atthe face of the panel, adapting the disk for ready andaccurate manipulation.

having a dial portion and operatively engaging said shaft and extendingcrossvvise thereof7 and a plate between which and said panel said diskis located, said plate being secured `to said panel and extending overthe face of said disk and exposing a portion of the periphery of saiddisk for the application of turning force theretoand said platecontaining a socket at YWhich said plate is adapted to fit over the endof said shaft in applying the plate to position.

WINSLOW GOODWIN.

While I have illustrated and described a particular embodiment of myinvention'I do not wish to be understood as intending to limit ittheretoas the same may be variously gaged With said shaft, and a platebetvveen which and said panel said disk is located,

ing a portion of the periphery of said disk for the application ofturning force thereto.

2. In radio receiving apparatus, the` combination ofa panel, tuningmechanism oomprising a shaft by the rotation of Which the Vtuning isVeifected and extending crossvvise of said panel, said panel containingan aperture in alinementwith said shaft anda disk

